pho·to·de·tec·tor

[foh-toh-di-tek-ter]
noun
2.
Electronics. any device, as a photodiode, phototube, or photovoltaic cell, that uses the photoelectric effect to convert radiant energy into an electrical signal.

Origin:
1945–50; photo- + detector

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Photodetector is always a great word to know.
So is interrobang. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Example sentences
The subject breathes into a tube that contains a laser, a system of mirrors,
  and a photodetector.
If the photons from the two ions are in the same state, the beam splitter will
  shunt both to one photodetector.
Precisely timed light pulses are launched into the fiber and strike a
  photodetector at the other end.
The fibers are recombined and connected to a photodetector.
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